# File test_format.rb, line 431
  def helper_test_empty_top_bottom (body_fmt, file_name)
    File.open(file_name, 
              File::CREAT | File::WRONLY | File::TRUNC) { |file|
      body_fmt.io = file
      blank = ""
      non_blank = "  "
      string = ("a"*100) + "b"
      body_fmt.printFormat(binding)
      body_fmt.finishPageWithoutFF(binding)
    }
  end